When you're a company concerned that you'll be enabling all kinds of horrible things by giving people a way for people to turn anonymous illegally-gotten money into goods and services, it sounds far less sinister when the only things you're allowing people to buy are intangible copies of intellectual property items that the evil people of the world could arguably just pirate anyway. When you're taking bitcoins for music, movies, and e-books, it's hard for someone to argue you're helping black-hat criminals, because these criminals don't pay for these in the first place, right? They jailbreak, crack, torrent, and pirate music and books. It's mind numbingly brilliant if this has anything to do with Amazon's future plans to differentiate themselves as innovators.
I like it. Amazon grants power to an amazon subsidiary to issue amazon coins. This subsidiary deals with the banking part. Legal problems would not be on amazon.